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  3. January 2022

Re: SQL question

It usually does to an RPG developer...

But a subselect is almost always a poor performing choice.

Take a look at this presentation,
https://www.linkedin.com/posts/charles-wilt-2a4a303_sql-for-the-rpg-developer-activity-6641756015354355712-woZR

Charles

On Mon, Jan 3, 2022 at 5:02 PM x y <xy6581@xxxxxxxxx> wrote:

Hmmm. FETCH FIRST ROW ONLY comes to mind in a subselect where the key is
item number and lead time.

On Mon, Jan 3, 2022 at 2:30 PM James H. H. Lampert via MIDRANGE-L <
midrange-l@xxxxxxxxxxxxxxxxxx> wrote:

Suppose we have a line-item file, and a part master file.

The line item records have a part number. And it cross-references to the
part master file.

But if a given part is stocked in two or more warehouses, then the part
master file has a record for it at each warehouse that stocks it.

Now, suppose we have a join between the line item file and the part
master file, on the part number. For each line item, the join is
returning a record for every matching part master record.

Not especially good. Is there a way, that works in DB2/400, to limit
that to only one join record per line item? And to select, for example,
the one with the low value in the "lead time" field?

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